arch/x86/kernel/setup_percpu.c

   1 #include <linux/kernel.h>
   2 #include <linux/module.h>
   3 #include <linux/init.h>
   4 #include <linux/bootmem.h>
   5 #include <linux/percpu.h>
   6 #include <linux/kexec.h>
   7 #include <linux/crash_dump.h>
   8 #include <linux/smp.h>
   9 #include <linux/topology.h>
  10 #include <asm/sections.h>
  11 #include <asm/processor.h>
  12 #include <asm/setup.h>
  13 #include <asm/mpspec.h>
  14 #include <asm/apicdef.h>
  15 #include <asm/highmem.h>
  16
  17 #ifdef CONFIG_X86_LOCAL_APIC
  18 unsigned int num_processors;
  19 unsigned disabled_cpus __cpuinitdata;
  20 /* Processor that is doing the boot up */
  21 unsigned int boot_cpu_physical_apicid = -1U;
  22 EXPORT_SYMBOL(boot_cpu_physical_apicid);
  23 unsigned int max_physical_apicid;
  24
  25 /* Bitmask of physically existing CPUs */
  26 physid_mask_t phys_cpu_present_map;
  27 #endif
  28
  29 /* map cpu index to physical APIC ID */
  30 DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
  31 DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
  32 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
  33 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
  34
  35 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
  36 #define X86_64_NUMA     1
  37
  38 /* map cpu index to node index */
  39 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
  40 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
  41
  42 /* which logical CPUs are on which nodes */
  43 cpumask_t *node_to_cpumask_map;
  44 EXPORT_SYMBOL(node_to_cpumask_map);
  45
  46 /* setup node_to_cpumask_map */
  47 static void __init setup_node_to_cpumask_map(void);
  48
  49 #else
  50 static inline void setup_node_to_cpumask_map(void) { }
  51 #endif
  52
  53 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
  54 /*
  55  * Copy data used in early init routines from the initial arrays to the
  56  * per cpu data areas.  These arrays then become expendable and the
  57  * *_early_ptr's are zeroed indicating that the static arrays are gone.
  58  */
  59 static void __init setup_per_cpu_maps(void)
  60 {
  61         int cpu;
  62
  63         for_each_possible_cpu(cpu) {
  64                 per_cpu(x86_cpu_to_apicid, cpu) =
  65                                 early_per_cpu_map(x86_cpu_to_apicid, cpu);
  66                 per_cpu(x86_bios_cpu_apicid, cpu) =
  67                                 early_per_cpu_map(x86_bios_cpu_apicid, cpu);
  68 #ifdef X86_64_NUMA
  69                 per_cpu(x86_cpu_to_node_map, cpu) =
  70                                 early_per_cpu_map(x86_cpu_to_node_map, cpu);
  71 #endif
  72         }
  73
  74         /* indicate the early static arrays will soon be gone */
  75         early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
  76         early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
  77 #ifdef X86_64_NUMA
  78         early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
  79 #endif
  80 }
  81
  82 #ifdef CONFIG_X86_32
  83 /*
  84  * Great future not-so-futuristic plan: make i386 and x86_64 do it
  85  * the same way
  86  */
  87 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
  88 EXPORT_SYMBOL(__per_cpu_offset);
  89 static inline void setup_cpu_pda_map(void) { }
  90
  91 #elif !defined(CONFIG_SMP)
  92 static inline void setup_cpu_pda_map(void) { }
  93
  94 #else /* CONFIG_SMP && CONFIG_X86_64 */
  95
  96 /*
  97  * Allocate cpu_pda pointer table and array via alloc_bootmem.
  98  */
  99 static void __init setup_cpu_pda_map(void)
 100 {
 101         char *pda;
 102         struct x8664_pda **new_cpu_pda;
 103         unsigned long size;
 104         int cpu;
 105
 106         size = roundup(sizeof(struct x8664_pda), cache_line_size());
 107
 108         /* allocate cpu_pda array and pointer table */
 109         {
 110                 unsigned long tsize = nr_cpu_ids * sizeof(void *);
 111                 unsigned long asize = size * (nr_cpu_ids - 1);
 112
 113                 tsize = roundup(tsize, cache_line_size());
 114                 new_cpu_pda = alloc_bootmem(tsize + asize);
 115                 pda = (char *)new_cpu_pda + tsize;
 116         }
 117
 118         /* initialize pointer table to static pda's */
 119         for_each_possible_cpu(cpu) {
 120                 if (cpu == 0) {
 121                         /* leave boot cpu pda in place */
 122                         new_cpu_pda[0] = cpu_pda(0);
 123                         continue;
 124                 }
 125                 new_cpu_pda[cpu] = (struct x8664_pda *)pda;
 126                 new_cpu_pda[cpu]->in_bootmem = 1;
 127                 pda += size;
 128         }
 129
 130         /* point to new pointer table */
 131         _cpu_pda = new_cpu_pda;
 132 }
 133
 134 #endif /* CONFIG_SMP && CONFIG_X86_64 */
 135
 136 #ifdef CONFIG_X86_64
 137
 138 /* correctly size the local cpu masks */
 139 static void __init setup_cpu_local_masks(void)
 140 {
 141         alloc_bootmem_cpumask_var(&cpu_initialized_mask);
 142         alloc_bootmem_cpumask_var(&cpu_callin_mask);
 143         alloc_bootmem_cpumask_var(&cpu_callout_mask);
 144         alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
 145 }
 146
 147 #else /* CONFIG_X86_32 */
 148
 149 static inline void setup_cpu_local_masks(void)
 150 {
 151 }
 152
 153 #endif /* CONFIG_X86_32 */
 154
 155 /*
 156  * Great future plan:
 157  * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
 158  * Always point %gs to its beginning
 159  */
 160 void __init setup_per_cpu_areas(void)
 161 {
 162         ssize_t size, old_size;
 163         char *ptr;
 164         int cpu;
 165         unsigned long align = 1;
 166
 167         /* Setup cpu_pda map */
 168         setup_cpu_pda_map();
 169
 170         /* Copy section for each CPU (we discard the original) */
 171         old_size = PERCPU_ENOUGH_ROOM;
 172         align = max_t(unsigned long, PAGE_SIZE, align);
 173         size = roundup(old_size, align);
 174
 175         pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
 176                 NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
 177
 178         pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);
 179
 180         for_each_possible_cpu(cpu) {
 181 #ifndef CONFIG_NEED_MULTIPLE_NODES
 182                 ptr = __alloc_bootmem(size, align,
 183                                  __pa(MAX_DMA_ADDRESS));
 184 #else
 185                 int node = early_cpu_to_node(cpu);
 186                 if (!node_online(node) || !NODE_DATA(node)) {
 187                         ptr = __alloc_bootmem(size, align,
 188                                          __pa(MAX_DMA_ADDRESS));
 189                         pr_info("cpu %d has no node %d or node-local memory\n",
 190                                 cpu, node);
 191                         pr_debug("per cpu data for cpu%d at %016lx\n",
 192                                  cpu, __pa(ptr));
 193                 } else {
 194                         ptr = __alloc_bootmem_node(NODE_DATA(node), size, align,
 195                                                         __pa(MAX_DMA_ADDRESS));
 196                         pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
 197                                 cpu, node, __pa(ptr));
 198                 }
 199 #endif
 200                 per_cpu_offset(cpu) = ptr - __per_cpu_start;
 201                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
 202         }
 203
 204         /* Setup percpu data maps */
 205         setup_per_cpu_maps();
 206
 207         /* Setup node to cpumask map */
 208         setup_node_to_cpumask_map();
 209
 210         /* Setup cpu initialized, callin, callout masks */
 211         setup_cpu_local_masks();
 212 }
 213
 214 #endif
 215
 216 #ifdef X86_64_NUMA
 217
 218 /*
 219  * Allocate node_to_cpumask_map based on number of available nodes
 220  * Requires node_possible_map to be valid.
 221  *
 222  * Note: node_to_cpumask() is not valid until after this is done.
 223  */
 224 static void __init setup_node_to_cpumask_map(void)
 225 {
 226         unsigned int node, num = 0;
 227         cpumask_t *map;
 228
 229         /* setup nr_node_ids if not done yet */
 230         if (nr_node_ids == MAX_NUMNODES) {
 231                 for_each_node_mask(node, node_possible_map)
 232                         num = node;
 233                 nr_node_ids = num + 1;
 234         }
 235
 236         /* allocate the map */
 237         map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
 238
 239         pr_debug("Node to cpumask map at %p for %d nodes\n",
 240                  map, nr_node_ids);
 241
 242         /* node_to_cpumask() will now work */
 243         node_to_cpumask_map = map;
 244 }
 245
 246 void __cpuinit numa_set_node(int cpu, int node)
 247 {
 248         int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
 249
 250         if (cpu_pda(cpu) && node != NUMA_NO_NODE)
 251                 cpu_pda(cpu)->nodenumber = node;
 252
 253         if (cpu_to_node_map)
 254                 cpu_to_node_map[cpu] = node;
 255
 256         else if (per_cpu_offset(cpu))
 257                 per_cpu(x86_cpu_to_node_map, cpu) = node;
 258
 259         else
 260                 pr_debug("Setting node for non-present cpu %d\n", cpu);
 261 }
 262
 263 void __cpuinit numa_clear_node(int cpu)
 264 {
 265         numa_set_node(cpu, NUMA_NO_NODE);
 266 }
 267
 268 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
 269
 270 void __cpuinit numa_add_cpu(int cpu)
 271 {
 272         cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
 273 }
 274
 275 void __cpuinit numa_remove_cpu(int cpu)
 276 {
 277         cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
 278 }
 279
 280 #else /* CONFIG_DEBUG_PER_CPU_MAPS */
 281
 282 /*
 283  * --------- debug versions of the numa functions ---------
 284  */
 285 static void __cpuinit numa_set_cpumask(int cpu, int enable)
 286 {
 287         int node = cpu_to_node(cpu);
 288         cpumask_t *mask;
 289         char buf[64];
 290
 291         if (node_to_cpumask_map == NULL) {
 292                 printk(KERN_ERR "node_to_cpumask_map NULL\n");
 293                 dump_stack();
 294                 return;
 295         }
 296
 297         mask = &node_to_cpumask_map[node];
 298         if (enable)
 299                 cpu_set(cpu, *mask);
 300         else
 301                 cpu_clear(cpu, *mask);
 302
 303         cpulist_scnprintf(buf, sizeof(buf), mask);
 304         printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
 305                 enable ? "numa_add_cpu" : "numa_remove_cpu", cpu, node, buf);
 306 }
 307
 308 void __cpuinit numa_add_cpu(int cpu)
 309 {
 310         numa_set_cpumask(cpu, 1);
 311 }
 312
 313 void __cpuinit numa_remove_cpu(int cpu)
 314 {
 315         numa_set_cpumask(cpu, 0);
 316 }
 317
 318 int cpu_to_node(int cpu)
 319 {
 320         if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
 321                 printk(KERN_WARNING
 322                         "cpu_to_node(%d): usage too early!\n", cpu);
 323                 dump_stack();
 324                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 325         }
 326         return per_cpu(x86_cpu_to_node_map, cpu);
 327 }
 328 EXPORT_SYMBOL(cpu_to_node);
 329
 330 /*
 331  * Same function as cpu_to_node() but used if called before the
 332  * per_cpu areas are setup.
 333  */
 334 int early_cpu_to_node(int cpu)
 335 {
 336         if (early_per_cpu_ptr(x86_cpu_to_node_map))
 337                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 338
 339         if (!per_cpu_offset(cpu)) {
 340                 printk(KERN_WARNING
 341                         "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
 342                 dump_stack();
 343                 return NUMA_NO_NODE;
 344         }
 345         return per_cpu(x86_cpu_to_node_map, cpu);
 346 }
 347
 348
 349 /* empty cpumask */
 350 static const cpumask_t cpu_mask_none;
 351
 352 /*
 353  * Returns a pointer to the bitmask of CPUs on Node 'node'.
 354  */
 355 const cpumask_t *cpumask_of_node(int node)
 356 {
 357         if (node_to_cpumask_map == NULL) {
 358                 printk(KERN_WARNING
 359                         "cpumask_of_node(%d): no node_to_cpumask_map!\n",
 360                         node);
 361                 dump_stack();
 362                 return (const cpumask_t *)&cpu_online_map;
 363         }
 364         if (node >= nr_node_ids) {
 365                 printk(KERN_WARNING
 366                         "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
 367                         node, nr_node_ids);
 368                 dump_stack();
 369                 return &cpu_mask_none;
 370         }
 371         return &node_to_cpumask_map[node];
 372 }
 373 EXPORT_SYMBOL(cpumask_of_node);
 374
 375 /*
 376  * Returns a bitmask of CPUs on Node 'node'.
 377  *
 378  * Side note: this function creates the returned cpumask on the stack
 379  * so with a high NR_CPUS count, excessive stack space is used.  The
 380  * node_to_cpumask_ptr function should be used whenever possible.
 381  */
 382 cpumask_t node_to_cpumask(int node)
 383 {
 384         if (node_to_cpumask_map == NULL) {
 385                 printk(KERN_WARNING
 386                         "node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
 387                 dump_stack();
 388                 return cpu_online_map;
 389         }
 390         if (node >= nr_node_ids) {
 391                 printk(KERN_WARNING
 392                         "node_to_cpumask(%d): node > nr_node_ids(%d)\n",
 393                         node, nr_node_ids);
 394                 dump_stack();
 395                 return cpu_mask_none;
 396         }
 397         return node_to_cpumask_map[node];
 398 }
 399 EXPORT_SYMBOL(node_to_cpumask);
 400
 401 /*
 402  * --------- end of debug versions of the numa functions ---------
 403  */
 404
 405 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
 406
 407 #endif /* X86_64_NUMA */
 408